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Go User Input
Go has multiple ways to receive inputs from the user.
In this chapter you will learn about the following functions:
Scan()Scanln()Scanf()
The Scan() Function
The Scan() function receives the user input in raw format as space-separated values and stores them in the variables. Newlines count as spaces.
Example
This example receives the value of i and
prints it:
package main
import ("fmt")
func main() {
var i int
fmt.Print("Type a number: ")
fmt.Scan(&i)
fmt.Println("Your number is:", i)
}
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You can have more than one user input.
Example
This example receives the values of i and j
and prints them:
package main
import ("fmt")
func main() {
var i,j int
fmt.Print("Type two numbers: ")
fmt.Scan(&i, &j)
fmt.Println("Your numbers are:", i, "and", j)
}
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Note: &i and &j are memory locations of i and j.
The Scanln() Function
The Scanln() function is similar to Scan(), but it stops scanning for inputs at a newline (at the press of the Enter key.).
Example
This example receives the values of i and j
and then prints them:
package main
import ("fmt")
func main() {
var i,j int
fmt.Print("Type two numbers: ")
fmt.Scanln(&i, &j)
fmt.Println("Your numbers are:", i, "and", j)
}
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The Scanf() Function
The Scanf() function receives the inputs and stores them based on the determined formats for its arguments.
Example
This example receives the values of i and j
and then prints them:
package main
import ("fmt")
func main() {
var i,j int
fmt.Print("Type two numbers: ")
fmt.Scanf("%v %v",&i, &j)
fmt.Println("Your numbers are:", i, "and", j)
}
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Example Explained
In this example, the inputs are received in exactly the same way defined in Scanf() formatting.
This means that the code expects inputs to be received with one space between them. Like: 1 2.
Note: %v tells Scanf() to store the value of the inputs in the variables.
It is possible to edit the code from example above to have different receiving formats.
Example
This example receives the values of i and j
in separate lines and then prints them:
package main
import ("fmt")
func main() {
var i,j int
fmt.Print("Type two numbers: ")
fmt.Scanf("%v\n%v",&i, &j)
fmt.Println("Your numbers are:", i, "and", j)
}
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